"What the impact of ObamaCare?" the ad's narrator asks asks. "The truth is, Americans are already seeing the benefits. She's seeing more seniors for free wellness visits. He received a $150 rebate from his health insurance company. And next year, she can expand her small business -- thanks to tax credits that cover up to half of her workers' health insurance."

The ad concludes, "Better coverage and lower costs -- that's what ObamaCare means for them. Get all the facts at BarackObama.com/HealthCare." NBC News has learned the ad is airing on national cable news, and it's part of a seven-figure ad buy over the summer.

This ad comes as the most recent NBC/WSJ poll found that just 37 percent of Americans said the health-care law was a good idea, versus 49 percent who said it was a bad idea.

That 49 percent on bad idea was the highest negative rating on that question since the NBC/WSJ poll began asking it in 2009.

It also comes as the law's opponents have outspent supporters on TV ads by a 5-to-1 ratio since 2010, per Kantar Media CMAG.